[en] This study aimed at checking the stability of some mutant lines from 2 soybean varieties in different locations and to select best performing lines in each location. These lines were selected according to previous experiments as being early maturing and/or that yield higher than the control. The experiments, lasted 3 years, were grown in a RCBD with 3 replicates for each variety. Results showed significant differences between line, location and year in both earliness and yield for the two varieties. Earliness was not correlated with any character except for height and nod number on the main stem in A2522 but was positively correlated with all characters (except for 100 seed wt) in A3803. Yield was positively and significantly correlated with all characters in all lines except for 100 seed wt in A2522. IN A2522 an early maturing mutant in more than 10 days 286b was selected but was average in yield, whereas 2 other lesser degree early but have higher yield than control were selected (286a, 439). In A3803 three lines with higher yield and as early as the control were selected (634, 496 and 69). (author). 32 tabs

[en] A Carbon gamma-ray spectrometric survey was carried out over the surface of Ar-Raqqa region. an area of 2800 Km² was covered by a total of 17 survey lines. The whole radiometric data were collected in one computer file which latter was processed to determine the equivalent concentration of uranium, thorium, potassium and the units of total radioactivity. The anomalies were classified, located and then assigned to their specific ground locations. It was found that the anomalous radiometric halos related to the lithological boundary between the Paleogene and Neogene as well as in few of their rock units. Also, some halos of relatively low values were related to the clastic accumulations resulted from the weathering of older rocks which may contain some grains with higher concentrations radioactive elements. Finally no anomalies suitable as a target for radioelement exploration were found. (author).9 refs., 6 figs

[en] Seasonal variations of lead concentration in roadside soils and plants in 12 sites in Damascus city have been investigated. Lead concentrations in soil were found to be varied from 78.4 ppm to 832 ppm; lower levels in the wet period than in the dry period were observed. While lead levels in roadside plants varied between 3.39 ppm to 13.28 ppm. The results have also shown that most of the vegetables grown on the roadside of Damascus city have high concentrations of lead and the normal washing does not decrease it to unacceptable level. (author). 15 refs., 9 tabs

[en] Fermion compositeness, and other types of new physics that can be described by the exchange of very massive particles, can manifest themselves as the result of an effective four-fermion contact interaction. In the case of the processes e⁺e^-→μ⁺μ^-, τ⁺τ^-, b-bar b and c-bar c at future e⁺e^- colliders with √s=0.5-1 TeV, we examine the sensitivity to four-fermion contact interactions of two new integrated observables, σ₊ and σ_-, conveniently defined for such kind of analysis. We find that, if longitudinal polarization of the electron beam were available, these observables would offer the opportunity to separate the helicity cross sections and, in this way, to derive model-independent bounds on the relevant parameters. (author)

[en] In a recent paper [Phys. Rev. Lett. 80 (1998) 1690], Krim and coworkers have observed that the friction force, acting on a thin physisorbed layer of N₂ sliding on a lead film, abruptly decreases by a factor of ∼2 when the lead film is cooled below its superconductivity transition temperature. We discuss the possible mechanisms for the abruptness of the sliding friction drop, and also discuss the relevance of these results to the problem of electronic friction. (author)

[en] Symptoms pathology, incidence, and gravity of the inherent syndrome called mucoviscidosis, or cystic fibrosis are described in this Part I. The analytical methods used for its diagnosis, both the conventional chemical ones and by neutron activation analysis are also summarised. Finally, an analytical method to study the incidence of mucoviscidosis in Brazil is presented. This , essentially, consists in bromine determination, in fingernails, by resonance neutron activation analysis. (author)

[en] This study deals with the theoretical and experimental aspects of the x-ray diffraction technique (XRD). The XRD technique is used to investigate fine structure of matter, and it is most efficient method for the determination of the mineralogical composition of rocks. The XRD technique is used also to investigate the clay mineralogical of mud-stones of the Nubian sandstones of north western Sudan. The XRD results revealed that the mud-stone samples are composed, in decreasing abundance's of kaolinite, smectite, chlorite and illite. Non-clay minerals reported include quartz, feldspars and geothite. Kaolinite dominates in most of samples with percentages ranging between 78-96%. Smectite comes second in abundance and ranges between 10-24%, followed by chlorite and illite which showed the lowest abundance's. The dominance of kaolinite over smectite indicates that intense chemical weathering and leaching occurred under warm humid climate interrupted by dry periods. Most probably these clay minerals were produced by inheritance and partly by neo formation. The variation of the chemical composition of these mud stones is due basically to differences in clay mineralogy which was controlled by source rock geology, weathering physicochemical behavior of elements, local environment and climatic condition in the past. (Author)

[en] Thirteen different samples of raw materials used in manufacturing of cement were collected from south Elgabalain area were Rabak cement raw materials available. The samples were crushed, ground and sieved. The concentration of the following elements and compound were determined using x-ray fluorescence technique (XRF) : TiO², Fe²O³, MnO², CaO, SrO, K²O, CO, Cu, Zn, As, Y, Zr, and Nb. XRF technique is found to be the most suitable one because it is non destructive, more rapid and simultaneous multi-element determined tool. (Author)

[en] The objective of this work is to address the modeling of the thermal hydrodynamic phenomena and interactions occurring during the progression of reactor severe accidents. Integrated phenomenological models are developed to describe the accident scenarios, which consist of many processes, while mechanistic modeling, including direct numerical simulation, is carried out to describe separate effects and selected physical phenomena of particular importance

[en] In order to combine wastewater purification and biomass production for energy purposes, a willow plantation for wastewater treatment was established in 1995 in Aarike, Southern Estonia. Wastewater from a dwelling house (25 person equivalents, pe) is treated in a combined free-water filter system consisting of three separate basins, isolated with clay and having filter beds of gravel and sand mixture. The beds were planted with Salix viminalis. At the end of the first growing season, the purification efficiency of the newly established treatment system was 65% for BOD₇, 43% for nitrogen and 11% for phosphorus removal. At the end of the establishment year, the above ground production of willow stems (bark and wood) and leaves was 1.3 and 0.3 t ha^-1, respectively. The figures are about three to five times higher than those recorded in previously established energy forest plantations of comparable ages in Estonia. 15 refs, 2 figs